26 REVIEW AND BIBLIOGRAPHY 



in an open dish. It is a yellowish substance, not decomposed by heat. 

 It contains 5.52 %C, which remains when this carbide is treated with 

 HNO3 (Gerhardt and Cahours). 



AgaC, is said to result by long heating of the silver salt of pyroracemic 

 acid (CHgCOCOOAg). It is a gray powder of metallic appearance, con- 

 taining about 10.5 1 %C. The same compound results from the silver salt 

 of maleic acid [C2H2(COOAg)2]. This carbide is produced by passing 

 acetylene gas through ammoniacal silver solutions. It is very unstable 

 and difficult to work with. See Keiser's and Plimpton's work. 



LITERATURE. 



Brown. J. prakt. Chem. (1839) 17, p. 492. 



LiEBiG and Redtenbachen. [Ag2C] Ueber das Atomgewicht des Kohlenstoffs. Ann. 



Chem. 38, p. 129. 

 Behal. Bull. Soc. China. 49, p. 335, and Ber. d. Chem. Ges. 21, ref. 609. 

 Berzelius. (Foot-note) Fogg. Ann. der Phys. 36, p. 28. 

 Gerhardt and Cahours. (?) 

 Gay-Lussac. (?) 

 Berend. [C2Ag2] Ueber einiger neue Derivate des Acetylens. Ann. Chem. 135, p. 



257- 

 Regnault. (Maleic acid) Untersuchung einiger ihrer Sake. Ann. der. Pharm. 19, p. 



153- 

 Plimpton. On silver acetylide. Proc. J. Chem. Soc. (1892) p. 109. 

 Keiser. Am. Chem. J. 14, p. 285, or Abs. J. Chem. Soc. 62, p. 1416 ; see also Ann. 



Chem. 118, p. 330. 



SODIUM AND CARBON. 



CgHNa and C2Na2 result by passing acetylene gas over sodium at a 

 dark red heat. C2Na2 is decomposed by water yielding acetylene. 



LITERATURE. 



Berthelot. Sur une nouvelle classe de radicaux metalliques composes. Bull. Soc. 



Chim. (1866) V, p. 182, and Ann. Chem. 139, p. 150, and Jsb. Chem. (1866) p. 514. 

 Forgrand. Chaleur de formation de I'acetylure de sodium. C. R. 120, p. 1215, and 



Bull. Soc. Chim. (1895), [3], 13, p. 996. 



STRONTIUM AND CARBON. 



SrC2 forms under about the same conditions obtaining in the produc- 

 tion of Ca or Ba carbides. It forms a dark mass, with yellowish fracture ; 

 sp. gr. = 3.19; with dilute acids and water it decomposes, giving off 

 chiefly acetylene. Reacts with halogens, oxygen, and sulphur at high 

 temperatures, but not with nitrogen, silicon, or boron. Both SrO and 

 SrCOa have been used in making SrC2, and a current of 350 amp. and 

 70 volts employed. 



LITERATURE. 

 Moissan. Etude des acetylures cristallises de baryum et de strontium. C. R. 118, p. 

 683, or Bull. Soc. Chim. [3] 11, p. 1007, or Chem. Centrbl. (1894) 65, pt. i, p. 856. 

 BuLLiER. D. R. P. 77,168. 



